Q: Which equation correctly represents the overall chemical reaction for cellular respiration?

$$ C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{energy} $$

Question 1

Which of the following best describes the main structural difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have a nucleus enclosed by a membrane, whereas prokaryotic cells lack a membrane-bound nucleus.

Question 2

Which organelle is primarily responsible for producing ATP in animal cells, and what is the main process it uses?

Accepted Answer

Mitochondrion; cellular respiration

Question 3

Which equation correctly represents the overall chemical reaction for cellular respiration?

Accepted Answer

$$ C_6H_{12}O_6$ + 6O_2 ightarrow 6CO_2 + 6H_2O + 	ext{energy} $$

Question 4

During photosynthesis, which molecule acts as the primary electron donor in the light reactions?

Accepted Answer

Water ($$ H_2O )$$

Question 5

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy, speeding up biochemical reactions.

Question 6

Which process in cellular respiration produces the most ATP per glucose molecule?

Accepted Answer

Oxidative phosphorylation (electron transport chain and chemiosmosis)

Question 7

A mutation causes a cell to produce a defective ATP synthase enzyme. Which step of cellular respiration would be most directly affected?

Accepted Answer

Oxidative phosphorylation

Question 8

Which of the following best explains why photosynthesis is essential for heterotrophic organisms?

Accepted Answer

Photosynthesis produces oxygen and organic molecules that heterotrophs use for cellular respiration.

Question 9

Which of the following is a correct description of the role of rubisco in the Calvin cycle?

Accepted Answer

Rubisco fixes carbon dioxide by catalyzing its attachment to ribulose bisphosphate ($$ RuBP ).$$

Question 10

Which of the following best describes the difference between catabolic and anabolic reactions?

Accepted Answer

Catabolic reactions release energy by breaking down molecules, while anabolic reactions consume energy to build molecules.

Question 11

A patient is diagnosed with a metabolic disorder that prevents the conversion of pyruvate to acetyl-CoA. Which stage of cellular respiration is directly impaired?

Accepted Answer

Citric acid cycle (Krebs cycle)

Question 12

Which of the following is a product of the light-dependent reactions of photosynthesis?

Accepted Answer

ATP

Question 13

Which of the following statements about fermentation is true?

Accepted Answer

Fermentation allows glycolysis to continue by regenerating NAD+ in the absence of oxygen.

Question 14

Which of the following best describes the function of microtubules in eukaryotic cells?

Accepted Answer

Microtubules provide structural support and are involved in chromosome movement during cell division.

Question 15

Which of the following equations represents the summary reaction for photosynthesis?

Accepted Answer

$$ 6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6$ + 6O_2 $$

Question 16

Which molecule is oxidized during cellular respiration, and what is the main product of its oxidation?

Accepted Answer

Glucose ($$ C_6H_{12}O_6$ $$); carbon dioxide ($$ CO_2$ )$$

Question 17

Which of the following best explains the role of NADPH in photosynthesis?

Accepted Answer

NADPH acts as an electron carrier, providing reducing power for the Calvin cycle.

Question 18

A scientist measures the temperature and pH at which an enzyme works best. What is the term for these conditions?

Accepted Answer

Optimal conditions

Question 19

Which of the following is a real-world example of an anabolic reaction?

Accepted Answer

The synthesis of proteins from amino acids during muscle growth

General Biology Study Guide: Cell Structure, Metabolism, Cellular Respiration, and Photosynthesis

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